Study of Mg–Ymm–Zn alloys with high-strength at elevated temperatures processed by water-cooled mold casting

Study of Mg–Ymm–Zn alloys with high-strength at elevated temperatures processed by water-cooled mold casting
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水冷模铸高温高强度Mg-Ymm-Zn合金的研究

DOI:
10.1016/j.msea.2014.05.042
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发表时间:
2014-07
影响因子:
6.4
通讯作者:
Milin Zhang
Milin Zhang
中科院分区:
材料科学1区
文献类型:
--
作者:
Shujuan Liu;Jian Meng;Ruizhi Wu;Milin Zhang

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采用水冷模铸造成功制备了直径为90-95 mm、长度为600 mm的高质量Mg-xYmm(x=6、9、12)-4Zn(Ymm=富Y混合稀土,wt%)合金锭,并对其显微组织和拉伸性能进行了研究。结果表明,合金中含有四种第二相:大量的18R LPSO和14H LPSO相以及少量的Mg3Zn3RE2和Mg24Y5型化合物。 Mg-12Ymm-4Zn合金的极限抗拉强度在400℃之前可以保持在130MPa以上。优异的高温强度主要归因于致密的LPSO片层强化镁基体和网络状LPSO相强化晶界。
The high quality Mg–xYmm (x=6, 9, 12)–4Zn (Ymm=Y-rich misch metal, wt%) alloy ingots with diameter of 90–95 mm and length of 600 mm were successfully fabricated by water-cooled mold casting, and the microstructure and tensile properties have been investigated. The results demonstrated that the alloys contained four secondary phases: a plenty of 18R LPSO and 14H LPSO phases and a few of Mg3Zn3RE2and Mg24Y5-type compounds. The ultimate tensile strength of Mg–12Ymm–4Zn alloy could keep above 130 MPa until 400 °C. The excellent high-temperature strength was mainly attributed to dense LPSO lamellae strengthening Mg matrix and network-like LPSO phase reinforcing grain boundaries.
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